Please advise as soon as possible.I have the opportunity to pick up a Cannondale CX9 its a 56cm frame, and on the road I ride a 56cm frame, the Cannondale website advises to take one size smaller for a cx bikeTHE QUESTIONS ....1. Why do Cannondale suggest a size below road size2. Would it matter to my performance if I took a road size frame (planned use - to train for and race the long distance 3 peaks cyclocross race in UK) 3. If I did take a 56 frame what changes to stem seat post saddle setup could be made to make it more cx friendly

Thanks for the reply.What are you comparing the CX9 with? My current road bike is a Cervelo R3SL which has a top tube length of 56.5cm.My torso is slightly short and my legs are slightly long.Is there a CX size guide available anywhere?

You'll need to cross reference the measurements on your Cervelo... Cannondale recommends (on their sizing) that you downsize 1 size based on the standard road bike sizing. They assume you are riding a SuperSix, Caad9, etc. I'm not sure how this sizing corresponds to Cervelo.

It's a good article Kervelo, but I would only add that the comments about frame size should be subject to specific comments from any given manufacturer.

I ride Cannondale road and cross and I can tell you that their "down one size" advice works for me - the 54 crosser is too long in the top tube, whereas the 52 lets me get the exact same position as my roadie ...

Thanks for all the advice, I also got some good advice from Toby at Wheelbase in Cumbria.Basically the rule of thumb is sit on the bike with saddle centralised & adjusted to desired height then grip the hoods and if your elbows are bent then its good.I also got the advice about the 10cm stem.The Cannondale advice re go for a frame size smaller is good - but only if your road bike is a Cannondale.Another interesting thig was the derivation of the term "rule of thumb" - in ancient times it was ok for a chap to beat his wife as long as the stick he used was no thicker than his thumb!!!

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